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Four digits in hands Hollow cylindrical feathers Tufted feathers Feathers closed and asymmetrical Long arms Toothless beak, fused wing digits, short feathered tail Eoraptor Coelophysoids 240 220 200 180 160 Allosaurids Compsognathids Ornithischian dinosaurs Tyrannosauroids Dromaeosaurids Oviraptorosaurs Archaeopteryx 140 120 100 80 60 40 Millions of years ago Crocodiles Living birds Black line segments denote first and last appearance based on fossils. Data from C. Zimmer, 2009, The Tangled Bonk, Greenwood Village, CO: Roberts and Company.

          Four digits
in hands
Hollow cylindrical feathers
Tufted feathers
Feathers closed and
asymmetrical
Long arms
Toothless beak, fused wing
digits, short feathered tail
Eoraptor
Coelophysoids
240 220
200
180
160
Allosaurids
Compsognathids
Ornithischian
dinosaurs
Tyrannosauroids
Dromaeosaurids
Oviraptorosaurs
Archaeopteryx
140
120 100 80
60
40
Millions of years ago
Crocodiles
Living birds
Black line segments
denote first and last
appearance based
on fossils.
Data from C. Zimmer, 2009, The Tangled Bonk, Greenwood Village, CO: Roberts and Company.

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Four digits
in hands
Hollow cylindrical feathers
Tufted feathers
Feathers closed and
asymmetrical
Long arms
Toothless beak, fused wing
digits, short feathered tail
Eoraptor
Coelophysoids
240 220
200
180
160
Allosaurids
Compsognathids
Ornithischian
dinosaurs
Tyrannosauroids
Dromaeosaurids
Oviraptorosaurs
Archaeopteryx
140
120 100 80
60
40
Millions of years ago
Crocodiles
Living birds
Black line segments
denote first and last
appearance based
on fossils.
Data from C. Zimmer, 2009, The Tangled Bonk, Greenwood Village, CO: Roberts and Company.

Added by Suzanne F.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Supreeta N

08/28/2023

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A monophyletic group is a group that includes an ancestral species and all of its descendants. Show more…

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Help ASAP, please. The crocodile group is the outgroup of the group that contains all the other animals in the tree. Give an example of a monophyletic group in this phylogeny: Explain what makes this group monophyletic. Crocodiles Ornithischian dinosaurs Eoraptor Coelophysoids Allosaurids Four digits in hands Compsagnathids GdilagcCORts d Cmpany Hollow cylindrical feathers Tyrannosauroids Tufted feathers Saurid Feathers closed and Oviraptorosaurs Asymmetrical og pa Archacopteryx Long arms Toothless beak, fused wing Living birds digits, short feathered tail 240 220 200 180 160 140 120 100 40 Black line segments Data from C.Zmmer, 2009 80 60 Millions of years ago denote first and last appearance based on fossils.

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